With the Spring Festival drawing near, the traffic will _____ necessity become heavier.

单选题

With the Spring Festival drawing near, the traffic will _____ necessity become heavier.

答案解析

单选题

Solenoid valves shall be shown with a notation indicating whether the valve is spring-loaded to the open or closed position.

答案解析

单选题

When the spring compresses, the valve opens.

答案解析

单选题

Make sure that the lock nut touches the spring.

答案解析

问答题

Spring

答案解析